I got an error ‘Cannot retrieve PI Point "\\hhpiserver\XL41252B.PV": A read lock may not be acquired with the write lock held in this mode.'
when I getting data from pi server recently.
What is the version of your AF Client/AFSDK?
If the version is < 2.6.1, then this may be due to a known issue with a deadlock situation after certain disconnections, and it is recommended to upgrade to at least 2.6.1, if not the latest version.
Retrieving data ...